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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California i ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDI3 GW Elevation Elevation Number Date (uglL) (uglL) (uglL) (uglL) (uglL) (ug1L) (uglL) (uglL) (ug/L) (uglL) (ug1L) (uglL) l(ug/L) (ug1L) (feet) (feet;msl) (feet met) Comments EVW4 03/03/00 n$ ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry 06/22100 ns - ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/08198 66,000 19,000 6900 3100 20,000 1A <0.50 <0.50 <0,50 <5.0 74.0 <5.0 59.10 nm nm strong odor/no sheen screened 12130/98 79,000 29,000 1600 3700 16,000 <100 na na na na na na 57.28 nm petrol.odorino sheen Interval 03/25/99 89,000 14,000 2700 3200 13,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.23 nm no comment 50'-65' 06103/99 39,000 10,000 1600 2900 11,000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30/99 50,000 9200 1500 3500 12,000 86 <20 <20 <20 <200 <2000 <200 850 64 56.53 nm no comment 12/10199 64,000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10.000 <200 710 42 56.61 nm no comment 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/22/00 55,000 6400 1600 3200 5400 <200 na na na na na na na na 56.01 nm odor/no sheen 03/28/01 41,000 5200 2000 2700 4600 <200 na na na na na na na na 55.00 nm odor/no sheen VW-5 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 37-47' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-6 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03128101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-7 1 03/03/00 ns ns n: ns ns ns ns ns ns rs ns nsns ns j nm n,n nm dry screened 06122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 37.47' 12122JD0 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03128/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry NOtBt' TPHg=total petroleum hydrocarbons as gasoline EDC=1,2-dichloroethane <=less than indicated reporting limit MTBE=methyl-tert-butyl ether EDB=1,2-dibromoethane ns=not sampled DIPE=diisopropyl ether GW=groundwater nm=not measured ETBE=ethyl-tert-butyl ether TOC=top of casing TAME=tert-amyl-methyl ether msl=mean sea level TBA=tert-butanol h ' 474gmr0o.As Prgact No.1474.44 Page 5 of 5 HORIZON ENVIRONMENTAL INC.